The main bearings maintain the crankshaft in the crankcase and operate under severe operating conditions, characterized by significant dynamic loads from the crankshaft journals and high rpm. In this case, because of friction, the bearings heat up, and their rubbing surfaces are subject to mechanical wear.

1. 190 (W201)
2. 190 Saloon (W201)
3. 123 Saloon (W123)
4. 123 T-Model (S123)
5. 123 Break (S123)
6. 124 Saloon (W124)
7. 124 T-Model (S124)
8. 124 Break (S124)
9. 123 Coupe (C123)
10. 124 Coupe (C124)
11. G-CLASS (W460)
12. T1 Bus (601)
13. T1 Van (601, 611)
14. T1 Platform/Chassis (601)
15. T1 Platform/Chassis (602)
16. G-MODELL (W460)
17. T1/TN Platform/Chassis
18. T1/TN Van
19. T1 Van (602)
20. G-CLASS Cabrio (W460)
21. See more in applications

The principles of the main bearings work

Intensive wear of the KING ENGINE BEARINGS brand Main bearing is largely prevented by an oil wedge, which forms in the interface between the bearing-journal of the crankshaft when the latter rotates. Because of the high oil pressure in the resulting oil wedge, the crankshaft literally floats up in the oil film, and during engine operation practically does not touch the surface of the liners.

The wear of the main bearings develops dynamically, since an oil film forms between the shaft journals and the bearing surface at a stable rotational speed and efficient operation of the lubrication system, which, under engine starting conditions, especially after a long break in operation, require a significant time to reach the optimum mode.